Data Sheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER
AH9279
General Description
The AH9279 is a most advanced fan control and
drive Hall IC manufactured by special CMOS
process. This IC consists of voltage reference, Hall
sensor, signal amplifier, wave shaping circuit, locked
rotor detector, locked rotor protection and restart
circuit, output drive circuit, etc.. To allow survival in
a harsh environment and in consideration of low cost,
the AH9279 has been designed with many functions
internally, and requires less external components.
When there is no motion for one second, the IC will
detect locked rotor conditions, enter protection mode
automatically and disable two outputs for five
seconds. Then, it will turn on drive current from one
channel for one second. If it still fails to detect fan
rotation, the AH9279 will shut off the outputs for five
seconds again. This sequence will be repeated until
rotation condition is detected and the IC enters
normal operation mode. This function prevents the
chip from overheating and damage due to long time
locked rotor.
The power dissipation decides allowable maximum
ambient temperature. Low power dissipation of
AH9279 and the output MOSFET power transistor
enable it to be used at ambient temperature up to
125°C on condition that the drive power is lower than
100mW or drive current is less than 200mA.
The AH9279 is available in TO-94 package.
Features
•
•
•
•
•
•
•
On Chip Hall Sensor
Built-in Zener Diodes Protection for Output
Driver
Power Efficient CMOS and Power MOSFET
Drivers Allow 400mA Without Overheating
5V and 12V Operation
High Sensitivity for Switching Symmetry
Locked Rotor Shutdown and Auto Restart
ESD Rating: 4000V(Human Body Model)
400V(Machine Model)
Applications
•
Dual-coil Brushless DC Fan
TO-94
Figure 1. Package Type of AH9279
Oct. 2011
Rev. 1. 3
1
BCD Semiconductor Manufacturing Limited
Data Sheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER
AH9279
Absolute Maximum Ratings (T
A
=25°C, Note 1)
Parameter
Supply Voltage
Supply current (Fault)
Output current
Power dissipation
Thermal Resistance (Junction to Ambient)
Symbol
V
CC
I
CC
I
OUT
P
D
θ
JA
Value
18
5
500
550
227
-55 to 150
4000
400
Unit
V
mA
mA
mW
°C
/W
°C
V
V
Storage Temperature
ESD (Human Body Model)
ESD (Machine Model)
T
STG
ESD
ESD
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Supply Voltage
Ambient Temperature
Symbol
V
CC
T
A
Min
3.5
-20
Max
16
125
Unit
V
°C
Oct. 2011
Rev. 1. 3
4
BCD Semiconductor Manufacturing Limited
模拟电子
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